y8 NEW YORK STATE MUSEUM 



ditions are known. The geological situation is decidedly unfavor- 

 able for such an enterprise on account of the crushing of the rocks 

 along the fault line; and the liability that the metagabbro cuts off 

 the ore is always present. Mr Newland, who visited the property 

 when operations were in progress, states that above the mine a con- 

 siderable distance up the slope another exposure of the graphite 

 schist occurs which is very likely an extension of the same bed, and 

 which offers more promising conditions for a successful mine. Is 

 the rock in the pit a downf aulted block ? Thus there may be more 

 ore in sight but it is very clear that the present mine is a failure. 



The following two mining properties were not visited by the 

 writer. The descriptions are based upon the published accounts, 

 especially Bastin's. 



The Adirondack (Graphite) Mining and Milling Company 



Location. " The mill and the mine of the Adirondack . 

 Company are about a mile northeast of the Champlain Graphite 

 Company's plant, near the wagon road which skirts the South Bay 

 shore." 1 The property was opened in 1904 but has remained idle 

 since 1907. " The hillside quarry is about 100 by 100 feet and 30 

 feet in maximum depth, and all of the rock exposed is more or less 

 graphitic." The ore is the characteristic quartz- feldspar schist, 

 readily cleavable, " which is more uniform in character than that at 

 the Champlain mine," probably due to the absence of faulting. 

 " The strike is quite regular and averages N 80 ° W. The dip is 

 about 30 south. A thickness of 25 feet ... is exposed." 2 

 " The graphite forms very fine, thin scales coating the cleavage 

 planes. It is accompanied by brown mica, garnet, quartz and 

 pyrite." 3 



" A thin section of the typical ore when examined under the 

 microscope shows quartz as the most abundant mineral with sharply 

 bounded . . [sericite] aggregates, which . . . represent 



altered feldspar grains and abundant brown biotite. Associated 

 with the last and for the most part interleaved with it occurs the 

 graphite, which according to an analysis made in the laboratory of 

 the United States Geological Survey, constitutes 5.29 per cent of 

 the rock. The sample analyzed was a composite one collected by the 

 writer [Bastin] from various parts of the quarry and probably 

 approaches closely the average run of the mine. Some chlorite and 

 zoisite occur, and certain bands parallel to the schistosity are very 



1 Bastin, E. S., Mineral Resources, U. S. G. S., 1909, 2: 823. 



2 Bastin, E. S., ibid. 



3 Newland, D. H., N. Y. State Mus. Bul.*i02, p. 76. 



